@Kevin_Z Hi Kevin, I've tried your way, which is to check if there is still a WAN on my router. I've checked it on the modem and router. both still have WAN. and also I've changed the DNS but still...

Hi, I just woke up, then when I wanted to open my cellphone. my internet can't be used. I tried to google about this. I've done several ways, such as turning off the modem and router Simultaneously....